8... f8h8 Black has managed to finish development and has a good position. The small weakness on a6 isn't important, compared to the benefits of the position, mainly the chance to start a pawn push in the center. 9. b1a2  9... e7e5 Too early. It's better to prepare the advance more carefully, starting with 9...Ba7 or 9...Kh8. 10. g1b6 A good move to finish development and to gain control off the d5-square. 10... c7b6 